feat(UI): rename message input

CLAUDE.md

@@ -91,13 +91,13 @@ Full UI package. Key architectural points:
 **Key UI components:**
 - `StreamChannelListView` + `StreamChannelListTile` — channel list using `StreamChannelListController`
 - `StreamMessageListView` — message list with floating date dividers, unread indicators, thread separators
-- `StreamMessageInput` (legacy) / `StreamChatMessageComposer` (new design system) — message composition
+- `StreamMessageComposer` (full-featured) / `StreamChatMessageInput` (new design system, UI-only) — message composition
 - `StreamMessageWidget` — renders individual messages with attachments, reactions, threads
 - Scroll views in `lib/src/scroll_view/` — generic paged scroll views for channels, threads, members, users, drafts, polls
 
 **New design system components** (`lib/src/components/`):
 - `StreamUserAvatar`, `StreamChannelAvatar`, `StreamUserAvatarGroup` — avatar components; these are chat-domain wrappers around the base components in `stream_core_flutter`
-- `StreamChatMessageComposer` — new composer using `MessageComposerFactory` for custom layouts
+- `StreamChatMessageInput` — new composer using `MessageComposerFactory` for custom layouts
 
 **Golden tests:** Use `alchemist` package. Platform goldens used locally, CI goldens used in CI (detected via `CI`/`GITHUB_ACTIONS` env vars). Goldens stored alongside tests in `goldens/` subdirectories.
 

docs/docs_screenshots/test/message_input/stream_message_input_test.dart → docs/docs_screenshots/test/message_input/stream_message_composer_test.dart

@@ -12,7 +12,7 @@ import '../src/mocks.dart';
 Widget _buildMessageInputScaffold({
   required MockClient client,
   required MockChannel channel,
-  StreamMessageInput? messageInput,
+  StreamMessageComposer? messageInput,
 }) {
   return MaterialApp(
     theme: docsScreenshotsTheme(),
@@ -28,7 +28,7 @@ Widget _buildMessageInputScaffold({
           body: Column(
             children: [
               Expanded(child: Container()),
-              messageInput ?? const StreamMessageInput(),
+              messageInput ?? StreamMessageComposer(),
             ],
           ),
         ),
@@ -46,7 +46,7 @@ void main() {
 
   goldenTest(
     'default state',
-    fileName: 'stream_message_input_default',
+    fileName: 'stream_message_composer_default',
     constraints: const BoxConstraints.tightFor(width: 375, height: 100),
     builder: () {
       final client = MockClient();
@@ -125,7 +125,7 @@ void main() {
               body: Column(
                 children: [
                   const Expanded(child: SizedBox()),
-                  StreamMessageInput(messageInputController: controller),
+                  StreamMessageComposer(messageInputController: controller),
                 ],
               ),
             ),
@@ -181,7 +181,7 @@ void main() {
               body: Column(
                 children: [
                   Expanded(child: Container()),
-                  const StreamMessageInput(),
+                  StreamMessageComposer(),
                 ],
               ),
             ),
@@ -218,7 +218,7 @@ void main() {
       return _buildMessageInputScaffold(
         client: client,
         channel: channel,
-        messageInput: StreamMessageInput(messageInputController: controller),
+        messageInput: StreamMessageComposer(messageInputController: controller),
       );
     },
   );

docs/docs_screenshots/test/src/mocks.dart

@@ -105,7 +105,7 @@ class MockChannelState extends Mock implements ChannelClientState {
   }
 }
 
-/// Sets up a [MockChannel] with all stubs required by [StreamMessageInput].
+/// Sets up a [MockChannel] with all stubs required by [StreamMessageComposer].
 void setupMockChannel({
   required MockClient client,
   required MockClientState clientState,

docs/docs_screenshots/test/voice_recording/voice_recording_test.dart

@@ -41,7 +41,7 @@ Widget _buildVoiceRecordingMessageInputScaffold({
           body: Column(
             children: [
               Expanded(child: Container()),
-              StreamMessageInput(
+              StreamMessageComposer(
                 enableVoiceRecording: true,
                 messageInputController: messageInputController,
               ),
@@ -93,7 +93,7 @@ Widget _buildVoiceRecordingContextScaffold({
                   ],
                 ),
               ),
-              const StreamMessageInput(enableVoiceRecording: true),
+              StreamMessageComposer(enableVoiceRecording: true),
             ],
           ),
         ),
@@ -103,11 +103,11 @@ Widget _buildVoiceRecordingContextScaffold({
 }
 
 /// Scaffold that shows a full message input bar (with attachment button and
-/// placeholder) using [StreamChatMessageComposer] so we can inject a custom
+/// placeholder) using [StreamChatMessageInput] so we can inject a custom
 /// [audioRecorderController] to control the recording state.
 ///
-/// The outer [Material] + bottom padding mirrors what [StreamMessageInput]
-/// wraps around [StreamChatMessageComposer] internally.
+/// The outer [Material] + bottom padding mirrors what [StreamMessageComposer]
+/// wraps around [StreamChatMessageInput] internally.
 Widget _buildVoiceRecordingComposerScaffold({
   required MockClient client,
   required MockChannel channel,
@@ -136,7 +136,7 @@ Widget _buildVoiceRecordingComposerScaffold({
                       ),
                       child: Padding(
                         padding: EdgeInsets.only(bottom: context.streamSpacing.md),
-                        child: StreamChatMessageComposer(
+                        child: StreamChatMessageInput(
                           onSendPressed: () {},
                           onAttachmentButtonPressed: () {},
                           placeholder: 'Send a message',